10491 - Cows and Cars
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注意a,b,c最好为double型,不然就隐式转换。
#include<bits/stdc++.h>using namespace std;double a,b,c;int main() { while(scanf("%lf%lf%lf",&a,&b,&c)!=EOF) { double t; t=(a*b+b*(b-1))/((a+b)*(a+b-c-1)); printf("%.5lf\n",t); } return 0;}
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